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For all those following the SEOS craze here is another entry into the chronicle. There are many designs floating around for the SEOS 12 due to its cost effectiveness and the DIY community rallying around the cause.

There are many woofer choices out there. I happened upon several Delta 12LFAs for a good deal sometime during the group buy when Erich was taking pre-orders. I did some research and found that Wayne over atPi Speakers used the Delta 12LFA as a woofer choice in his 3pi speaker offerings. In a brief exchange with Wayne on his forum I found that the Delta 12LFA was relatively flat and a worthy choice for a woofer in a high efficiency design crossed 900-1200.

I picked up 4 LFAs and pre-ordered with the regular bunch on here throughDIYSG. Shortly after I contacted Bwaslo about working up a crossover for the LFA. I shipped him a woofer and hedid the workand donated it to me and the rest of the DIY Community.

The box alignment and crossover discussion can be found here, but below is the final crossover he came up with:

The reason for the detail surrounding the woofer choice is there are several woofer choices out there now and the reason I chose this woofer is not b/c I feel its necessarily superior but for a few reasons:

- I got 4 D12LFAs for $200 shipped on a used deal
- The D12LFA works good in a sealed cab 2.0-2.5ft^3 with a F3 about 80Hz.
- Bwaslo was kind enough to work me a crossover for it.

Since the drivers and hardware are now discussed. Lets discuss enclosure. I wanted to use a sealed alignment. All my subs are sealed and I have ample mid-bass to the point that I didn’t feel the need to tune lower to try to make the mains work lower into the mid-bass area. I am building the “test” box to 2.5 before drivers and bracing which I feel will net somewhere 2.2-2.0 ft^3.

Here is an excursion plot with 2.5ft^3 and a 80Hz 12db/octave crossover eating 125W. I have never needed to crossover lower in my room but I run a multiple sub setup and active EQ.

There have been some really sweet SEOS designs coming out lately. I have been just watching a drooling while you guys build some killer speakers. However, thanks to all of you, I would not be happy with yet another build. Thanks to you I talked myself into a curved build. The resource I used for kerfing is found here.

If you follow the hyperlink that guy with the how to has done a lot to make kerfing easier for the layperson. There is a little trigonometry in there but not much. I found the info invaluable I can't imagine doing this by trial and error.......

Cool cabs! Looking forward to following the rest of the build and hearing your listening impressions.

Thanks G!

Quote:

Originally Posted by Java

Nick + SEOS = Awesome

Javajava, hope i dont let you down!

Quote:

Originally Posted by ChopShop1

Love the curved cabinets!! Can't wait to see these all finsihed up.

Thank Chopshop1,

The curve adds a bit of difficulty but i learned a lot doing the first one.

Bear with with me guys its gonna be a slow build. Im building one complete without finish to measure. Once measurement is done and im sure crossover wont require any tweaks ill press on with the other two.

Bwaslo measured the drivers separate and worked the crossover in pcd but i want to see in box combined measurents before i solder up the rest of the crossovers.

I've enjoyed reading so much of the enthusiasm wrt the SEOS builds. Although I'm not currently interested in a build for myself, nor do I need one .... I really dig watching these various builds. And it's quite refreshing seeing a build variant w/the curved cabinet, and any other trend toward possible additional refinement.

no, those two look fine. imagine flux lines streaming out through the center hole of one coil. what you don't want is for them to easily stream through the center of the other coil from one side. in your arrangement any flux from one coil wouldn't easily enter the other and any that does would enter equally from either end of the hole. So coupling would be nil.

Now this part im a little embarrased to show. Since my brain was on overload i didnt include a front to back brace for the baffle. I always knew i wanted one but wasnt sure where to put it.... The final two boxes will have this brace integrated into the window bracing.

Anyways here it is(as my OCD eye twitches) Argh!!!!!!

I gets dark too quick! Im over winter now, summer time! I might just get this thing together before I go on vacation for a listen.........

Hopefully no one will quote that image and I'll just edit in the pretty boxes from the L and R build. This is my first curved build so technically its a prototype. I do intend to use it though as it should be functionally equivalent.

Hopefully no one will quote that image and I'll just edit in the pretty boxes from the L and R build. This is my first curved build so technically its a prototype. I do intend to use it though as it should be functionally equivalent.

Measured progress this weekend. Did flush trim on the top/bottom and added double baffle.

Completion Checklist

Rout recesses

Install terminal cup

Install crossover

Install drivers

measure and confirm no crossover crossover tweaks needed

Perform roundovers and pretty up cabinet

Apply Duratex

It might seem I stalled a bit, as I'm going on vacation. So no updates or progress until I get back on the 26th. Its so hard for me to put this project down and walk past it every day!!! However I'm off of work most of the week after I return so I'm hopeful to at least get some measurements by that week of the 31st..........

I can't believe that you are going to duratex those awesome cabinets instead of using a nice stain or at least some glossy paint! That absolutely pains me to think about! But, it's your baby and if you want to duratex then I can't stop you. I am looking forward to seeing them completed!